Emmanuel, Lucien and Willy describe their job as formwork setters at VINCI Construction. The work is exacting. It prepares the construction of concrete walls. Formwork is used in a wide variety of projects: viaducts, bridges and tunnels. It is also used to build high-rise buildings and - in a less-well-known application - nuclear facilities. Emmanuel, Lucien and Willy explain the values of solidarity that exist in their job, the prospects for their work and the in-depth technological change affecting it. "This is a job you never stop learning."